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Broad phylogenomic sampling improves resolution of the animal tree of life
This data reinforce several previously identified clades that split deeply in the animal tree, unambiguously resolve multiple long-standing issues for which there was strong conflicting support in earlier studies with less data, and provide molecular support for the monophyly of molluscs, a group long recognized by morphologists. Expand
Assessing the root of bilaterian animals with scalable phylogenomic methods
  • A. Hejnol, M. Obst, +14 authors C. Dunn
  • Biology, Medicine
  • Proceedings of the Royal Society B: Biological…
  • 22 December 2009
New sequence data and methods strongly uphold previous suggestions that Acoelomorpha is sister clade to all other bilaterian animals, find diminishing evidence for the placement of the enigmatic Xenoturbella within Deuterostomia, and place Cycliophora with Entoprocta and EctoproCTa. Expand
Xenacoelomorpha is the sister group to Nephrozoa
The position of Xenacoelomorpha in the tree of life remains a major unresolved question in the study of deep animal relationships. Xenacoelomorpha, comprising Acoela, Nemertodermatida, andExpand
Nuclear genomic signals of the ‘microturbellarian’ roots of platyhelminth evolutionary innovation
Using a survey of genomes and transcriptomes representing all free-living flatworm orders, resolution of platyhelminth interrelationships is provided based on hundreds of nuclear protein-coding genes, exploring phylogenetic signal through concatenation as well as recently developed consensus approaches to support a modern hypothesis of flatworm phylogeny. Expand
Genomic evidence for ameiotic evolution in the bdelloid rotifer Adineta vaga
The genome of a bdelloid rotifer, Adineta vaga, is reported and it is shown that its structure is incompatible with conventional meiosis, and abundant evidence of gene conversion is found, which may limit the accumulation of deleterious mutations in the absence of meiosis. Expand
Higher-level metazoan relationships: recent progress and remaining questions
The relationships of the five main metazoan lineages—Porifera, Ctenophora, Placozoa, Cnidaria and Bilateria—remain subject to conflicting topologies according to different taxonomic samples and analytical approaches. Expand
A developmental perspective: changes in the position of the blastopore during bilaterian evolution.
Recent studies that shed light on the transition from a radially organized ancestor to the last common ancestor of the Bilateria ("Urbilaterian") are reviewed and an integrative hypothesis about plausible developmental scenarios for the evolution of complex multicellular animals is presented. Expand
Animal Phylogeny and Its Evolutionary Implications
There is far more homoplasy for all these characters than had previously been anticipated, even among many complex characters such as segmentation and nervous systems, which has important implications for the understanding of the evolution of development, morphology, genomes, and other characters. Expand
High-resolution fate map of the snail Crepidula fornicata: the origins of ciliary bands, nervous system, and muscular elements.
This study uses intracellular cell lineage tracers in combination with high-resolution confocal imaging to investigate the contribution of early blastomeres to the veliger larva, and shows that both first and second velar ciliary bands are generated by the same cells that form the prototroch in other spiralians. Expand
Acoel development indicates the independent evolution of the bilaterian mouth and anus
The hypothesis that the bilaterian mouth and anus evolved simultaneously from a common blastoporal opening is contradicted, and it is suggested that a through gut might have evolved independently in different animal lineages. Expand